基于有效绿灯时间利用率的自适应控制策略研究

为了优化单点交叉口信号控制方案,使其适应各个进口道方向交通流动态变化,提高交叉口通行效率,根据交叉口进口道排队车辆数建立有效绿灯利用率模型,提出了一种交叉口自适应控制策略.有效绿灯时间利用率模型以交叉口通行能力最大为控制参数,实时优化确定出最佳相位放行方案以及最优相位切换方案,根据进口道排队车辆最大流向的排队车辆数和车辆到达预测确定相位放行绿灯时间.利用VISSIM交通仿真软件对该自适应控制策略仿真运行,与定时控制以及感应控制对比,评价分析不同车辆到达情况下交叉口通行情况.结果表明:该自适应控制策略能有效降低车均延误,提高交叉口服务水平.

Adaptive Control Strategy Based on Effective Utilization Ratio of Green Light Time

In order to optimize signal control strategy of single point intersection, adapting the dynamic traffic flow and improving the efficiency of intersection signal control, based on the number of queuing vehicles to establish effective green light time utilization model, the intersection adaptive control strategy was proposed. Intersection capacity utilization was the control parameter for the effective green light time utilization model, optimization phase release scheme and phase switching scheme were determined by this model. The phase release green light time was calculated by the largest number of queuing vehicles and vehicle arrival prediction. Using traffic simulation software VISSIM, the adaptive control strategy was emulated. And compared with fixed timing control and inductive control, intersection traffic situation was evaluated and analyzed under the situation of different vehicle arrival. The result shows that the adaptive control strategy can effectively reduce the average traffic delay and improve the intersection service level.